Biosteres is a genus of wasps belonging to the family Braconidae.

The genus was first described by Förster in 1862.

The genus has almost cosmopolitan distribution.

Species:

• Biosteres arenarius (Stelfox, 1959) - also known as Opius arenarius in Ireland, found in France, Germany, Turkey, and Iran
• Biosteres blandus (Haliday, 1837) - also known as Opius blandus, hosts include Pegomya and Agromyza
• Biosteres brevipalpis (Thomson, 1895)
• Biosteres carbonarius Nees, 1834
• Biosteres haemorrhoeus (Haliday, 1837) - hosts are of the genus Pegomya, including P. bicolor
• Biosteres longicauda (Thomson, 1895)
• Biosteres spinaciae (Thomson, 1895)
• Biosteres tryoni (Cameron, 1911) - parasitoid of Ceratitis capitata
• Biosteres wesmaelii Haliday, 1837
• Biosteres vandenboschi

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